Microscopy. MICROSCOPY Light Electron Tunnelling Atomic Force RESOLVE: => INCREASE CONTRAST BIODIVERSITY I BIOL1051 MAJOR FUNCTIONS OF MICROSCOPES
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1 BIODIVERSITY I BIOL1051 Microscopy Professor Marc C. Lavoie marc.lavoie@cavehill.uwi.edu MAJOR FUNCTIONS OF MICROSCOPES MAGNIFY RESOLVE: => INCREASE CONTRAST Microscopy 1. Eyepieces 2. Diopter adjustment ring 3. Revolving nosepiece 4. Objective 5. Specimen holder 6. Transport lock pin 7. Aperture iris diaphragm knob 8. Condenser centering screws 9. Condenser 10. Filter holder 11. Field iris diaphragm ring 12. Y-axis knob 13. X-axis knob 14. Coarse focus adjustment knob 15. Fine focus adjustment knob 16. Stage 17. Ligh intensity control knob 18. Main switch 19. Transport lock pin 20. Microscope frame 21. Dummy slider 22. Observation tube 23. Interpupillary distance scale Principle of light microscopy The objective produces an amplified inverted image of the specimen The eyepiece amplifies the image produced by the objective The eye sees a virtual image of the object at about 10 inches away. Eyepiece or ocular Field number Magnifies the image produced by the objective Usually 5X or 10X Different field-of-view (6-28 mm) Field Size (mm) = FN / OM FN: Field Number OM: Objective Magnification 1
2 Eyepiece or ocular MOST IMPORTANT PART Projects an accurate inverted image of object Numerical Aperture (light-grasping ability) = most important information. Permits calculation of: Useful magnification Resolution Depth of field Objective Magnification TOTAL MAGNIFICATION = Objective magnification X eyepiece magnification Magnification Useful Magnification = (500 to 1000) x NA (Objective) Ex: Is it worth using a 20 X eyepiece with this objective? Useful Magn. = 1000 X 0.95 = X 60 = X 60 = 1200 Resolution Resolution Resolution (r) = λ/(2na) Resolution (r) = 0.61 λ /NA Resolution (r) = 1.22 λ /(NAobj + NAcond) r = distance at which two objects will be seen as separated. The smaller this distance, the better is the resolution power. So, the greater the NA, the better N.A. = numerical aperture of the objective λ = wavelength r = λ/2 N.A. Smaller r = better resolution What light colour will give the better resolution? V, B, G, Y, O, R 2
3 Depth of field The depth of field means the thickness of the specimen that can be focussed at the same time. Df = R x n / M x NA Df = depth of field R = diameter of the confusion circle that is a measure of the fuzziness of the image. This value must be lower than 0.2 and a value of is used for calculations. n = refractive index at the interface between the objective and the specimen M = magnification of the objective NA = Numerical Aperture of the objective Microscopy Bright field microscopy Oil immersion microscopy Phase contrast microscopy Dark field microscopy Differential Interference Contrast or DIC Polarised light microscopy Ultra violet light microscopy Fluorescence microscopy Confocal microscopy & Confocal laser scanning microscopy Bright field microscopy Probably the only one you will ever see. Even student microscopes can provide spectacular views Limitations: Resolution Illumination Contrast Improvements: Oil immersion Dark field Phase contrast Differential Interference Contrast Best for: stained or naturally pigmented specimens. Useless for: living specimens of bacteria Inferior for: non-photosynthetic protists, metazoans, unstained cell suspensions, tissue sections Oil immersion microscopy At higher magnifications, the amount of light passing the object is reduced Immersion oil reduces the diffracted light, increasing the amount going through the object. Refractive index: Air: 1 Immersion oil: Glass: Phase contrast microscopy Increases contrast Translates minute variations in phase into corresponding changes in amplitude, which can be visualised as differences in image contrast. Excellent for living unstained cells For his invention of phase-contrast microscopy, Zernike was awarded the 1953 Nobel Prize in Physics. 3
4 Dark field microscopy Opaque disk in light path Only light scattered by objects reaches the eye The object seen as white on black background like dust in a sun ray (a) Bright field illumination (b) Dark field illumination (c) Dark field with red filter Cells of the baker s yeast Saccharomyces cerevisiae visualized by different types of light microscopy. (a)bright-field microscopy. (b) Phase-contrast microscopy. (c) Dark-field microscopy. Cells average 8 10 µm wide. Fluorescence microscopy Many substances (fluorochromes) emit light when irradiated at a certain wavelength (Auto fluorescence) Some can be made fluorescent by treatment with fluorochromes (Secondary fluorescence) Preparations can be treated with fluorescent antibodies (Immunofluorescence) or fluorescent genetic probes (FISH) Fluorescence microscopy Fluorescence microscopy. (a, b) Cyanobacteria. (a) Cells observed by bright-field microscopy. Fluorescence microscopy (b) The same cells observed by fluorescence microscopy (cells exposed to light of 546 nm). The cells fluoresce red because they contain chlorophyll a and other pigments. (c) Fluorescence photomicrograph of cells of Escherichia coli made fluorescent by staining with the fluorescent dye, DAPI. 4
5 Fluorescence microscopy Shallow depth of field Elimination of out-offocus glare Ability to collect serial optical sections from thick specimens Illumination achieved by scanning one or more focused beams of light (laser) across the specimen Stage vs beam scanning Confocal microscopy Confocal microscopy Confocal microscopy Images fixed or living cells Gives 3-D images Specimen has to be labelled with fluorescent probes Resolution between light microscopes & TEM Neurons Wolbachia in red Lilly double fecondation microscopy r = λ/2 N.A. = smaller wavelength than visible light => better resolution (nm vs µm) Modern TEM can reach a resolution power of nm Transmission electron microscopy (TEM) High resolution electron microscopy (HREM) Scanning electron microscopy (SEM) 5
6 Transmission electron microscopy (TEM) beam produced in vacuum Beam focus on sample by magnetic field lenses Operates under high voltage (50 to 150 kv) beams deflected by object Degree deflection permits image formation Image formed on fluorescent plate or camera Specimens have to be coated with metal Transmission electron microscopy (TEM) Herpes virus in nucleus Bacterium in macrophage Scanning electron microscopy (SEM) Resolution: SEM < TEM Depth focus: SEM > TEM Surface object scan by electron beams => secondary electrons Collected on detector Signal increased Image on viewing screen Preparations have to be coated with metal Scanning electron microscopy (SEM) Neutrophile migrating across endothelium Scanning electron micrograph of M. paratuberculosis Microscopy Piezo-electric scanner position sharp tip above object current or z changes recorded Transformed into corresponding 3-D image ATOMS CAN BE VISUALISED! 6
7 Microscopy Oh Where, Oh Where Has My Xenon Gone? Oh Where, Oh Where Can He Be? Xenon on Nickel Microscopy Images at atomic level Measures forces at nano- Newton scale Force between tip and object measured by deflection of µ-cantilever Atomically sharp tip scan on surface of object Differences in height are converted => 3-D images 1. Laser, 2. Mirror, 3. Photodetector, 4. Amplifier, 5. Register, 6. Sample, 7. Probe, 8. Cantilever. Microscopy AFM topographs of purple membrane from Halobacterium salinarium. From: REFERENCES Microscope parts: More specialised sites on microscopy: Virtual Microscope: 7
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